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How much energy is needed for the electrolysis of water?

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The minimum voltage necessary to generate hydrogen and oxygen from water by electrolysis is 1.23 V. It depends on how you do it if it will take that much or more (if you don't use the correct electrode, it will take much more, but never ever less).

How much power it takes depends on how much water you want to split!

First answer by JEK. Last edit by JEK. Contributor trust: 2959 [recommend contributor recommended]. Question popularity: 16 [recommend question].

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